[Schulisco]

Originally Posted by joe912/62

Where is that located

Refer to https://jimsbasementworkshop.com/CIS/pages/descr_lambda.html

The frequency valve is here named as "timing valve (#11)". This name might confuse a bit. It realizes the the lambda control on managing the mixture for the fuel distributor. It's controlled by the ECU under the passenger seat and is located right behind the air filter box close to the throttle valve. It must be vibrating when engine is cranked and fuel pump is running. If it's not working engine start is hard but not impossible, but the engine won't run on her own without pushing the throttle to keep the engine running.

Get familiar with the lambda CIS as much as you can to get the engine running again. From far away it's pretty hard to find the culprit because in the end - everything on a CIS could be the reason.

I heavily also recommend Curts YT Channel from Klassikats.com:
https://www.youtube.com/playlist?list=PLkWFofpgz2OgF9FdliKnlzuY0pygqRkMj

Although those videos are primarily intended for the 2,7 CIS engines, the priniciples are pretty the same on a 3,0 SC.

Thomas